Siemens 3RT2636-1NP35 Capacitor Contactor S2, 50kVAr, 175-280V AC/DC, 2 NC Contact Original Brand New

Overview

The Siemens 3RT2636-1NP35 is a specialized capacitor contactor from the SIRIUS 3RT2 series, engineered for reliable and efficient switching of capacitive loads. This particular model, sized at S2, is rated for an AC-6b load of 50 kVA at 400 V. Its core functionality lies in its integrated precharging resistors, which are engaged by leading auxiliary contacts.

This innovative design effectively limits the peak charging current of capacitive loads, minimizing disruptive impacts on the power supply network and extending the lifespan of your equipment.

The 3RT2636-1NP35 is equipped with a versatile 175-280 V AC/DC control supply voltage, making it suitable for a wide range of applications.

It features an integrated varistor for overvoltage protection, and its auxiliary contacts include two normally closed (2 NC) connections, providing additional control and feedback options. The contactor utilizes a secure screw terminal for easy and robust wiring.

Benefits:

• Improved Power Quality: Precharging resistors limit peak charging currents, reducing network disturbances and voltage sags.
• Extended Equipment Lifespan: Minimizes stress on capacitors and other components by controlling inrush currents.
• Versatile Control: Operates on a wide range of AC/DC control voltages (175-280V).
• Enhanced Safety: Integrated varistor provides effective protection against damaging overvoltage spikes.
• Easy Integration: Standardized design and screw terminals simplify installation and wiring.
• Robust and Reliable: Built to IEC standards for dependable performance in demanding industrial environments.

Function:

The 3RT2636-1NP35 capacitor contactor is specifically designed for switching capacitive loads in applications such as reactive current compensation systems and converter circuits. Its key function is to manage the high inrush currents that occur when switching capacitors. This is achieved by the precharging resistors, which are briefly connected in series with the capacitors via leading auxiliary contacts. This allows the capacitors to charge gradually, significantly reducing the initial current surge. Once the capacitors are partially charged, the main contacts close, bypassing the resistors for normal operation. The integrated varistor protects the contactor’s coil from overvoltage spikes, ensuring long-term reliability.

Standards:

• IEC 60947-1
• IEC 60947-4-1
• IEC 60947-5-1
• IEC 60831-1
• IEC 61921

Protection:

• Short-circuit and overload protection of main connections: Requires external protection devices as specified in the product’s technical data sheet and configuration manuals.
• Short-circuit and overload protection of auxiliary connections: Must be protected with suitable measures as detailed in the technical product data sheet.
• Short-circuit and overload protection of control supply voltage: Selection of a suitable power supply with current-limiting function and appropriate protection devices is essential.
• Overvoltage protection: An integrated varistor protects the coil circuit. Optional surge suppressors (RC elements, diodes, etc.) can be added for further damping.

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